小弟想做个样式更改的，但不知为啥三元运算没结果出来 求大佬指导
hxml
<scroll-view class="left_content" scroll-y>
<view class="cata_name {{num==cur_num? 'active' : ' '}}" wx:for="{{catagory_left_list}}" wx:for-item="cata_item" wx:key="cata" data-num="{{index}}" bindtap="changePage">{{cata_item.cat_name}}</view>
</scroll-view>
js
data: {
catagory_left_list:[],
catagory_right_list:[],
cur_num:0
}
changePage:function(e){
console.log(e)
let index = e.currentTarget.dataset.num;
this.setData({
cur_num:index,
catagory_right_list:this.catas[e.currentTarget.dataset.num].children
})
}
{{index==cur_num?'active':''}}<scroll-view class="left_content"><view class="cata_name {{index==cur_num? 'active' : ' '}}"wx:for="{{catagory_left_list}}" wx:key="index"data-index="{{index}}"bindtap="changePage"> {{item.cat_name}}</view></scroll-view>changePage:function(e){console.log(e)let index = e.currentTarget.dataset.index;this.setData({cur_num:index,})}<view wx:for="{{navList}}" wx:key="item" data-id="{{item.id}}" data-current="{{index}}" bindtap="swichNav" class="{{index == currentTab ? 'active' : ''}}">{{item.name}}</view>
wx:for放在前面 class在后面，可查看以上代码
{{num==cur_num? 'active' : ' '}}" 改成 {{index==cur_num? 'active' : ' '}}if 和 for 不要在同一个标签使用